# bash cs.sh 10

# if 语句可以直接对命令状态进行判断，就省去了获取$?这一步！
# 如果第一个条件符合就不再向下匹配
#!/bin/bash
# this check grade shell
# by author rivers on 2021-09-27

grade=$1
if [ $grade -gt 90 ];then
echo "Is's very good!"
elif [ $grade -gt 70 ];then
echo "Is's is good!"

elif [ $grade -ge 60 ];then
echo "pass"

else
echo "no pass"
fi